JP5253311B2 - Pixel and organic light emitting display using the same - Google Patents

Pixel and organic light emitting display using the same Download PDF

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JP5253311B2
JP5253311B2 JP2009161091A JP2009161091A JP5253311B2 JP 5253311 B2 JP5253311 B2 JP 5253311B2 JP 2009161091 A JP2009161091 A JP 2009161091A JP 2009161091 A JP2009161091 A JP 2009161091A JP 5253311 B2 JP5253311 B2 JP 5253311B2
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陽完 金
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Description

本発明は、画素及びこれを用いた有機電界発光表示装置に関し、特に、第１電源の電圧降下及び電圧リップル（ｒｉｐｐｌｅ）にかかわらず、所望の画質の映像を表示することのできる画素及びこれを用いた有機電界発光表示装置に関する。   The present invention relates to a pixel and an organic light emitting display using the same, and more particularly to a pixel capable of displaying an image with a desired image quality regardless of a voltage drop and a ripple of a first power source. The present invention relates to an organic electroluminescent display device used.

近年、陰極線管（Ｃａｔｈｏｄｅ Ｒａｙ Ｔｕｂｅ）の短所である重量及び体積を減らすことが可能な各種平板表示装置が開発されている。平板表示装置には、液晶表示装置（Ｌｉｑｕｉｄ Ｃｒｙｓｔａｌ Ｄｉｓｐｌａｙ）、電界放出表示装置（Ｆｉｅｌｄ Ｅｍｉｓｓｉｏｎ Ｄｉｓｐｌａｙ）、プラズマ表示パネル（Ｐｌａｓｍａ Ｄｉｓｐｌａｙ Ｐａｎｅｌ）、及び有機電界発光表示装置（Ｏｒｇａｎｉｃ Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉｓｐｌａｙ）などがある。   2. Description of the Related Art In recent years, various flat panel display devices capable of reducing the weight and volume, which are disadvantages of a cathode ray tube, have been developed. The flat panel display device includes a liquid crystal display device, a field emission display device, a plasma display panel, and an organic light emitting display device such as an organic light emitting display device.

平板表示装置のうち、有機電界発光表示装置は、電子と正孔との再結合により光を発生する有機発光ダイオードを用いて映像を表示する。このような有機電界発光表示装置は、速い応答速度を有し、かつ、低消費電力で駆動されるという長所がある。   Among the flat panel display devices, the organic light emitting display device displays an image using an organic light emitting diode that generates light by recombination of electrons and holes. Such an organic light emitting display device has an advantage of having a fast response speed and being driven with low power consumption.

一般に、有機電界発光表示装置の画素は、ストレージキャパシタに第１電源及びデータ信号の差に対応する電圧を充電し、充電された電圧に対応する電流を有機発光ダイオードに供給しながら所定の映像を表示する。ここで、第１電源は、画素に電流を供給する電圧であり、電圧降下が比較的大きいという問題がある。したがって、第１電源の電圧降下により、ストレージキャパシタには所望の電圧が充電されず、これにより、所望の画質の映像を表示できないという問題が発生する。   In general, a pixel of an organic light emitting display device charges a storage capacitor with a voltage corresponding to a difference between a first power source and a data signal, and supplies a current corresponding to the charged voltage to an organic light emitting diode. indicate. Here, the first power supply is a voltage for supplying a current to the pixel, and there is a problem that the voltage drop is relatively large. Therefore, the storage capacitor is not charged with a desired voltage due to the voltage drop of the first power supply, and this causes a problem that an image with a desired image quality cannot be displayed.

大韓民国特許公開第２００８−００００４６８号Korean Patent Publication No. 2008-0000468 大韓民国特許公開第２００５−０１０９１６３号Korean Patent Publication No. 2005-0109163

そこで、本発明の目的は、第１電源の電圧降下及び電圧リップルにかかわらず所望の画質の映像を表示することのできる画素及びこれを用いた有機電界発光表示装置を提供することである。   Accordingly, an object of the present invention is to provide a pixel capable of displaying an image having a desired image quality regardless of a voltage drop and a voltage ripple of a first power supply, and an organic light emitting display device using the pixel.

本発明の実施例による画素は、データ信号が供給されるデータ線、走査信号が供給される走査線、発光制御信号が供給される発光制御線、第１電源、及び基準電源に接続される画素回路と、前記画素回路と第２電源との間に接続される有機発光ダイオードとを備える画素であって、前記データ線と第１ノードとの間に接続され、ゲート電極が前記走査線に接続される第１トランジスタと、前記基準電源と第２ノードとの間に接続され、ゲート電極が前記走査線に接続される第３トランジスタと、前記第１ノードと前記第２ノードとの間に接続されるストレージキャパシタと、前記第１電源と前記有機発光ダイオードとの間に接続され、ゲート電極が前記第２ノードに接続される第２トランジスタと、前記第１電源と前記第１ノードとの間に接続され、ゲート電極が前記発光制御線に接続される第４トランジスタとを備える。   A pixel according to an embodiment of the present invention includes a data line to which a data signal is supplied, a scanning line to which a scanning signal is supplied, a light emission control line to which a light emission control signal is supplied, a first power source, and a pixel connected to a reference power source. A pixel comprising: a circuit; and an organic light emitting diode connected between the pixel circuit and a second power source, connected between the data line and a first node, and a gate electrode connected to the scanning line A first transistor connected between the reference power source and the second node, a gate electrode connected between the scan line and a third transistor connected between the first node and the second node. A storage capacitor, a second transistor connected between the first power source and the organic light emitting diode and having a gate electrode connected to the second node; and between the first power source and the first node. Close to It is, and a fourth transistor having a gate electrode coupled to the emission control line.

本発明の実施例による有機電界発光表示装置の駆動方法は、データ信号と基準電源との差に対応するデータ電圧をストレージキャパシタに充電するステップと、駆動トランジスタの第１電極に第１電源の電圧を供給するステップと、前記データ電圧及び前記第１電源に対応する駆動電圧を前記駆動トランジスタのゲート電極に供給するステップと、前記駆動トランジスタの第２電極に接続された有機発光ダイオードに前記駆動電圧に対応する電流を供給するステップとを含む。   A method of driving an organic light emitting display according to an embodiment of the present invention includes a step of charging a storage capacitor with a data voltage corresponding to a difference between a data signal and a reference power source, and a voltage of the first power source on the first electrode of the driving transistor. Supplying a driving voltage corresponding to the data voltage and the first power source to the gate electrode of the driving transistor; and driving voltage to the organic light emitting diode connected to the second electrode of the driving transistor. Supplying a current corresponding to.

本発明の実施例による有機電界発光表示装置は、データ信号が供給される複数のデータ線と、走査信号が供給される複数の走査線と、発光制御信号が供給される複数の発光制御線と、前記データ線、走査線、及び発光制御線によって区画された領域に位置する複数の画素とを備え、前記画素の各々は、前記走査信号に対応して前記データ信号を前記画素に供給するための第１トランジスタと、前記走査信号に対応して基準電源を前記画素に供給するための第３トランジスタと、前記データ信号と前記基準電源との差に該当するデータ電圧を充電するためのストレージキャパシタと、前記発光制御信号に対応して前記ストレージキャパシタの第１端子に第１電源を供給するための第４トランジスタと、自身のゲート電極に印加された電圧に対応する電流を供給するための第２トランジスタと、前記第２トランジスタから供給される電流に対応して光を生成する有機発光ダイオードとを備え、前記ストレージキャパシタの第１端子に前記第１電源が供給されたとき、前記ストレージキャパシタの第２端子には前記データ電圧及び第１電源に対応する電圧が印加される。   An organic light emitting display according to an embodiment of the present invention includes a plurality of data lines to which data signals are supplied, a plurality of scanning lines to which scanning signals are supplied, and a plurality of light emission control lines to which light emission control signals are supplied. A plurality of pixels located in a region defined by the data line, the scanning line, and the light emission control line, and each of the pixels supplies the data signal to the pixel corresponding to the scanning signal. A first transistor, a third transistor for supplying a reference power to the pixel corresponding to the scanning signal, and a storage capacitor for charging a data voltage corresponding to a difference between the data signal and the reference power And a fourth transistor for supplying a first power to the first terminal of the storage capacitor in response to the light emission control signal, and a voltage applied to its gate electrode A second transistor for supplying a current to be supplied, and an organic light emitting diode for generating light corresponding to the current supplied from the second transistor, wherein the first power source is supplied to a first terminal of the storage capacitor. Then, a voltage corresponding to the data voltage and the first power source is applied to the second terminal of the storage capacitor.

本発明の他の実施例による有機電界発光表示装置は、前記走査信号に対応して前記データ信号と前記基準電源との差に該当する電圧を充電するストレージキャパシタを備える画素回路と、前記画素回路と前記第２電源との間に接続される有機発光ダイオードとを備え、前記ストレージキャパシタの第１端子が前記第１電源に接続されたとき、前記ストレージキャパシタの第２端子は、フローティング状態に設定される。   The organic light emitting display according to another embodiment of the present invention includes a pixel circuit including a storage capacitor that charges a voltage corresponding to a difference between the data signal and the reference power source in response to the scan signal, and the pixel circuit. And an organic light emitting diode connected between the second power source and the second terminal of the storage capacitor is set in a floating state when the first terminal of the storage capacitor is connected to the first power source. Is done.

このような本発明の実施例による画素及びこれを用いた有機電界発光表示装置によれば、基準電圧とデータ信号とを用いてストレージキャパシタを所望の電圧に充電することができる。また、第１電源の電圧降下が補償されるように駆動トランジスタのゲート電極の電圧が制御されるため、所望の画質の映像を表示することができる。また、ストレージキャパシタの第１端子が第１電源に接続され、ストレージキャパシタの第２端子が駆動トランジスタのゲート電極に接続されるため、第１電源のリップルにかかわらず所望の画質の映像を表示することができる。   According to the pixel and the organic light emitting display using the pixel according to the embodiment of the present invention, the storage capacitor can be charged to a desired voltage using the reference voltage and the data signal. Further, since the voltage of the gate electrode of the driving transistor is controlled so that the voltage drop of the first power supply is compensated, an image with a desired image quality can be displayed. In addition, since the first terminal of the storage capacitor is connected to the first power supply and the second terminal of the storage capacitor is connected to the gate electrode of the drive transistor, an image with a desired image quality is displayed regardless of the ripple of the first power supply. be able to.

本発明の実施例による有機電界発光表示装置を示す図である。1 is a diagram illustrating an organic light emitting display according to an embodiment of the present invention. 図１における画素の実施例を示す図である。It is a figure which shows the Example of the pixel in FIG. 図２における画素の駆動方法を示すタイミング図である。FIG. 3 is a timing chart showing a method for driving the pixel in FIG. 2.

以下、本発明の属する技術分野における通常の知識を有する者が本発明を容易に実施できる好ましい実施例を、添付した図１ないし図３を参照して詳細に説明する。   Hereinafter, a preferred embodiment in which a person having ordinary knowledge in the technical field of the present invention can easily implement the present invention will be described in detail with reference to FIGS.

図１は、本発明の実施例による有機電界発光表示装置を示す図である。図１に示すように、本発明の実施例による有機電界発光表示装置は、走査線Ｓ１〜Ｓｎ、発光制御線Ｅ１〜Ｅｎ、及びデータ線Ｄ１〜Ｄｍに接続される複数の画素１４０を備える画素部１３０と、走査線Ｓ１〜Ｓｎ及び発光制御線Ｅ１〜Ｅｎを駆動するための走査駆動部１１０と、データ線Ｄ１〜Ｄｍを駆動するためのデータ駆動部１２０と、走査駆動部１１０及びデータ駆動部１２０を制御するためのタイミング制御部１５０とを備える。   FIG. 1 illustrates an organic light emitting display device according to an embodiment of the present invention. As shown in FIG. 1, an organic light emitting display according to an embodiment of the present invention includes a plurality of pixels 140 connected to scan lines S1 to Sn, light emission control lines E1 to En, and data lines D1 to Dm. Unit 130, scan driver 110 for driving scan lines S1 to Sn and light emission control lines E1 to En, data driver 120 for driving data lines D1 to Dm, scan driver 110 and data drive A timing control unit 150 for controlling the unit 120.

画素部１３０は、走査線Ｓ１〜Ｓｎとデータ線Ｄ１〜Ｄｍとの交差部に位置する画素１４０を備える。画素１４０は、外部から第１電源ＥＬＶＤＤ、第２電源ＥＬＶＳＳ、及び基準電源Ｖｒｅｆを受ける。基準電源Ｖｒｅｆを受けた画素１４０の各々は、基準電源Ｖｒｅｆとデータ信号とに対応する電圧をストレージキャパシタ（図示せず）に充電する。   The pixel unit 130 includes pixels 140 located at intersections of the scanning lines S1 to Sn and the data lines D1 to Dm. The pixel 140 receives a first power supply ELVDD, a second power supply ELVSS, and a reference power supply Vref from the outside. Each of the pixels 140 receiving the reference power supply Vref charges a storage capacitor (not shown) with a voltage corresponding to the reference power supply Vref and the data signal.

ストレージキャパシタに所定の電圧を充電した画素１４０の各々は、充電された電圧に対応する電流を、第１電源ＥＬＶＤＤから有機発光ダイオード（図示せず）を経由して第２電源ＥＬＶＳＳに供給する。すると、有機発光ダイオードで所定輝度の光が生成される。   Each of the pixels 140 having the storage capacitor charged with a predetermined voltage supplies a current corresponding to the charged voltage from the first power supply ELVDD to the second power supply ELVSS via the organic light emitting diode (not shown). Then, light with a predetermined luminance is generated by the organic light emitting diode.

タイミング制御部１５０は、外部から供給される同期信号に対応してデータ駆動制御信号ＤＣＳ及び走査駆動制御信号ＳＣＳを生成する。タイミング制御部１５０で生成されたデータ駆動制御信号ＤＣＳはデータ駆動部１２０に供給され、走査駆動制御信号ＳＣＳは走査駆動部１１０に供給される。また、タイミング制御部１５０は、外部から供給されるデータＤａｔａをデータ駆動部１２０に供給する。   The timing controller 150 generates a data drive control signal DCS and a scan drive control signal SCS in response to a synchronization signal supplied from the outside. The data drive control signal DCS generated by the timing controller 150 is supplied to the data driver 120, and the scan drive control signal SCS is supplied to the scan driver 110. In addition, the timing control unit 150 supplies data Data supplied from the outside to the data driving unit 120.

走査駆動部１１０は、走査駆動制御信号ＳＣＳを受信する。走査駆動制御信号ＳＣＳを受信した走査駆動部１１０は、走査線Ｓ１〜Ｓｎに走査信号（ローレベル電圧）を順次供給する。また、走査駆動制御信号ＳＣＳを受信した走査駆動部１１０は、発光制御線Ｅ１〜Ｅｎに発光制御信号（ハイレベル電圧）を順次供給する。ここで、ｉ（ｉは自然数）番目の発光制御線Ｅｉに供給される発光制御信号は、ｉ番目の走査線Ｓｉに供給される走査信号と重畳されるように供給される。   The scan driver 110 receives the scan drive control signal SCS. The scan driver 110 that has received the scan drive control signal SCS sequentially supplies scan signals (low level voltages) to the scan lines S1 to Sn. The scan driver 110 that has received the scan drive control signal SCS sequentially supplies a light emission control signal (high level voltage) to the light emission control lines E1 to En. Here, the light emission control signal supplied to the i-th emission control line Ei (i is a natural number) is supplied so as to be superimposed on the scanning signal supplied to the i-th scanning line Si.

データ駆動部１２０は、タイミング制御部１５０からデータ駆動制御信号ＤＣＳを受信する。データ駆動制御信号ＤＣＳを受信したデータ駆動部１２０は、データ信号を生成し、生成されたデータ信号をデータ線Ｄ１〜Ｄｍに供給する。   The data driver 120 receives the data drive control signal DCS from the timing controller 150. The data driver 120 that has received the data driving control signal DCS generates a data signal and supplies the generated data signal to the data lines D1 to Dm.

図２は、図１における画素の実施例を示す図である。図２では、説明の便宜上、第ｎ走査線Ｓｎ及び第ｍデータ線Ｄｍに接続された画素を示すものとする。   FIG. 2 is a diagram illustrating an example of the pixel in FIG. In FIG. 2, for convenience of explanation, pixels connected to the nth scanning line Sn and the mth data line Dm are shown.

図２に示すように、本発明の画素１４０は、有機発光ダイオードＯＬＥＤと、有機発光ダイオードＯＬＥＤに電流を供給するための画素回路１４２とを備える。   As shown in FIG. 2, the pixel 140 of the present invention includes an organic light emitting diode OLED and a pixel circuit 142 for supplying current to the organic light emitting diode OLED.

有機発光ダイオードＯＬＥＤは、画素回路１４２から供給される電流に対応して、所定色の光を生成する。例えば、有機発光ダイオードＯＬＥＤは、画素回路１４２から供給される電流量に対応して、所定輝度を有する赤色、緑色、または青色の光を生成する。   The organic light emitting diode OLED generates light of a predetermined color corresponding to the current supplied from the pixel circuit 142. For example, the organic light emitting diode OLED generates red, green, or blue light having a predetermined luminance corresponding to the amount of current supplied from the pixel circuit 142.

画素回路１４２は、基準電源Ｖｒｅｆとデータ信号とに対応する電圧を充電し、充電された電圧に対応する電流を有機発光ダイオードＯＬＥＤに供給する。このため、画素回路１４２は、第１ないし第４トランジスタＭ１〜Ｍ４と、ストレージキャパシタＣｓｔとを備える。   The pixel circuit 142 charges a voltage corresponding to the reference power supply Vref and the data signal, and supplies a current corresponding to the charged voltage to the organic light emitting diode OLED. Therefore, the pixel circuit 142 includes first to fourth transistors M1 to M4 and a storage capacitor Cst.

第１トランジスタＭ１の第１電極はデータ線Ｄｍに接続され、第２電極は第１ノードＮ１に接続される。また、第１トランジスタＭ１のゲート電極は走査線Ｓｎに接続される。この第１トランジスタＭ１は、走査線Ｓｎに走査信号が供給されたときにターンオンされ、データ線Ｄｍと第１ノードＮ１とを電気的に接続させる。   The first electrode of the first transistor M1 is connected to the data line Dm, and the second electrode is connected to the first node N1. The gate electrode of the first transistor M1 is connected to the scanning line Sn. The first transistor M1 is turned on when a scanning signal is supplied to the scanning line Sn, and electrically connects the data line Dm and the first node N1.

第２トランジスタＭ２の第１電極は第１電源ＥＬＶＤＤに接続され、第２電極は有機発光ダイオードＯＬＥＤに接続される。また、第２トランジスタＭ２のゲート電極は第２ノードＮ２に接続される。この第２トランジスタＭ２は、第２ノードＮ２に印加される電圧、すなわち、ストレージキャパシタＣｓｔに充電された電圧に対応する電流を有機発光ダイオードＯＬＥＤに供給する。   The first electrode of the second transistor M2 is connected to the first power supply ELVDD, and the second electrode is connected to the organic light emitting diode OLED. The gate electrode of the second transistor M2 is connected to the second node N2. The second transistor M2 supplies a current corresponding to a voltage applied to the second node N2, that is, a voltage charged in the storage capacitor Cst, to the organic light emitting diode OLED.

第３トランジスタＭ３の第１電極は第２ノードＮ２に接続され、第２電極は基準電源Ｖｒｅｆに接続される。また、第３トランジスタＭ３のゲート電極は走査線Ｓｎに接続される。この第３トランジスタＭ３は、走査線Ｓｎに走査信号が供給されたときにターンオンされ、基準電源Ｖｒｅｆと第２ノードＮ２とを電気的に接続させる。   The first electrode of the third transistor M3 is connected to the second node N2, and the second electrode is connected to the reference power supply Vref. The gate electrode of the third transistor M3 is connected to the scanning line Sn. The third transistor M3 is turned on when a scanning signal is supplied to the scanning line Sn, and electrically connects the reference power source Vref and the second node N2.

第４トランジスタＭ４の第１電極は第１電源ＥＬＶＤＤに接続され、第２電極は第１ノードＮ１に接続される。また、第４トランジスタＭ４のゲート電極は発光制御線Ｅｎに接続される。この第４トランジスタＭ４は、発光制御信号が供給されたときにターンオフされ、発光制御信号が供給されないときにターンオンされる。発光制御信号は、走査信号と重畳されるように供給されるため、第４トランジスタＭ４は、ストレージキャパシタＣｓｔに所定の電圧が充電される期間においてターンオフされ、その他の期間においてターンオンされる。   The first electrode of the fourth transistor M4 is connected to the first power supply ELVDD, and the second electrode is connected to the first node N1. The gate electrode of the fourth transistor M4 is connected to the light emission control line En. The fourth transistor M4 is turned off when the light emission control signal is supplied, and is turned on when the light emission control signal is not supplied. Since the light emission control signal is supplied so as to be superimposed on the scanning signal, the fourth transistor M4 is turned off during a period when the storage capacitor Cst is charged with a predetermined voltage, and is turned on during the other periods.

ストレージキャパシタＣｓｔの第１端子は第１ノードＮ１に接続され、第２端子は第２ノードＮ２に接続される。このストレージキャパシタＣｓｔは、基準電源Ｖｒｅｆとデータ信号との差に対応する電圧を充電する。このため、データ信号は、基準電源Ｖｒｅｆと同一または高い電圧に設定される。また、データ信号は、第１電源ＥＬＶＤＤより低い電圧に設定される。   The first terminal of the storage capacitor Cst is connected to the first node N1, and the second terminal is connected to the second node N2. The storage capacitor Cst is charged with a voltage corresponding to the difference between the reference power supply Vref and the data signal. For this reason, the data signal is set to the same or higher voltage as the reference power supply Vref. The data signal is set to a voltage lower than the first power supply ELVDD.

一方、第１電源ＥＬＶＤＤは、画素１４０の各々に接続されて所定の電流を供給し、これにより、画素１４０の位置に応じて互いに異なる電圧降下が発生する。しかし、基準電源Ｖｒｅｆは、画素１４０の各々に電流を供給せず、これにより、画素１４０の位置に関係なく同じ電圧値を維持することができる。   On the other hand, the first power source ELVDD is connected to each of the pixels 140 and supplies a predetermined current, thereby causing different voltage drops depending on the position of the pixel 140. However, the reference power supply Vref does not supply a current to each of the pixels 140, thereby maintaining the same voltage value regardless of the position of the pixel 140.

図３は、図２における画素の駆動方法を示すタイミング図である。   FIG. 3 is a timing chart showing a method of driving the pixel in FIG.

図３に示すように、まず、発光制御線Ｅｎに発光制御信号が供給され、第４トランジスタＭ４がターンオフされる。この後、走査線Ｓｎに走査信号が供給され、第１トランジスタＭ１及び第３トランジスタＭ３がターンオンされる。   As shown in FIG. 3, first, a light emission control signal is supplied to the light emission control line En, and the fourth transistor M4 is turned off. Thereafter, a scanning signal is supplied to the scanning line Sn, and the first transistor M1 and the third transistor M3 are turned on.

第１トランジスタＭ１がターンオンされると、データ信号ＤＳがデータ線Ｄｍから第１ノードＮ１に供給される。第３トランジスタＭ３がターンオンされると、基準電源Ｖｒｅｆの電圧が第２ノードＮ２に供給される。このとき、ストレージキャパシタＣｓｔは、基準電源Ｖｒｅｆとデータ信号との差に対応する電圧を充電する。   When the first transistor M1 is turned on, the data signal DS is supplied from the data line Dm to the first node N1. When the third transistor M3 is turned on, the voltage of the reference power supply Vref is supplied to the second node N2. At this time, the storage capacitor Cst is charged with a voltage corresponding to the difference between the reference power supply Vref and the data signal.

ここで、ストレージキャパシタＣｓｔは、第１電源ＥＬＶＤＤとは無関係に電圧が充電される。したがって、ストレージキャパシタＣｓｔに充電される電圧は、第１電源ＥＬＶＤＤの電圧降下にかかわらず所望の電圧に決定される。   Here, the storage capacitor Cst is charged with a voltage regardless of the first power supply ELVDD. Therefore, the voltage charged in the storage capacitor Cst is determined to be a desired voltage regardless of the voltage drop of the first power supply ELVDD.

ストレージキャパシタＣｓｔに所定の電圧が充電された後、走査信号及び発光制御信号の供給が中断される。   After the storage capacitor Cst is charged with a predetermined voltage, the supply of the scanning signal and the light emission control signal is interrupted.

走査線Ｓｎに走査信号の供給が中断されると、第１トランジスタＭ１及び第３トランジスタＭ３がターンオフされる。発光制御線Ｅｎに発光制御信号の供給が中断されると、第４トランジスタＭ４がターンオンされる。   When the supply of the scanning signal to the scanning line Sn is interrupted, the first transistor M1 and the third transistor M3 are turned off. When the supply of the light emission control signal to the light emission control line En is interrupted, the fourth transistor M4 is turned on.

第４トランジスタＭ４がターンオンされると、第１電源ＥＬＶＤＤの電圧が第１ノードＮ１に供給される。このとき、第２ノードＮ２は、フローティング状態に設定されるため、第１ノードＮ１の電圧変化量に対応して第２ノードＮ２の電圧が変化し、これにより、第１電源ＥＬＶＤＤの電圧降下を補償することができる。   When the fourth transistor M4 is turned on, the voltage of the first power source ELVDD is supplied to the first node N1. At this time, since the second node N2 is set in a floating state, the voltage of the second node N2 changes corresponding to the voltage change amount of the first node N1, thereby reducing the voltage drop of the first power supply ELVDD. Can be compensated.

より詳細に説明すると、第１電源ＥＬＶＤＤの電圧降下電圧が増加するほど、第１ノードＮ１の電圧上昇量は減少する。例えば、第１画素において、第１電源ＥＬＶＤＤの電圧が５Ｖ、第１ノードＮ１の電圧が３Ｖに設定された場合、第１ノードＮ１の電圧上昇量は２Ｖに設定される。また、第２画素において、第１電源ＥＬＶＤＤの電圧が４Ｖ、第１ノードＮ１の電圧が３Ｖに設定された場合、第１ノードＮ１の電圧上昇量は１Ｖに設定される。   More specifically, as the voltage drop voltage of the first power supply ELVDD increases, the voltage increase amount at the first node N1 decreases. For example, in the first pixel, when the voltage of the first power supply ELVDD is set to 5V and the voltage of the first node N1 is set to 3V, the voltage increase amount of the first node N1 is set to 2V. In the second pixel, when the voltage of the first power source ELVDD is set to 4V and the voltage of the first node N1 is set to 3V, the voltage increase amount of the first node N1 is set to 1V.

この場合、第２トランジスタＭ２のゲート電極とソース電極との間の電圧は、第１電源ＥＬＶＤＤの電圧降下にかかわらず一定の電圧を維持することができ、これにより、第１電源ＥＬＶＤＤの電圧降下を補償することができる。つまり、第２トランジスタＭ２のゲート電極に印加される電圧（同じデータ信号の場合）は、第１電源ＥＬＶＤＤの電圧降下が増加するほど減少し、これにより、第１電源ＥＬＶＤＤの電圧降下を補償することができる。   In this case, the voltage between the gate electrode and the source electrode of the second transistor M2 can be maintained at a constant voltage regardless of the voltage drop of the first power supply ELVDD, and thereby the voltage drop of the first power supply ELVDD. Can be compensated. That is, the voltage applied to the gate electrode of the second transistor M2 (in the case of the same data signal) decreases as the voltage drop of the first power supply ELVDD increases, thereby compensating for the voltage drop of the first power supply ELVDD. be able to.

一方、第１電源ＥＬＶＤＤのリップルにより第１ノードＮ１の電圧が変化しても、ストレージキャパシタＣｓｔに充電された電圧は変化せずに一定電圧を維持する。例えば、第１電源ＥＬＶＤＤのリップルにより第１ノードＮ１の電圧が上昇した場合、第２ノードＮ２の電圧も上昇するため、ストレージキャパシタＣｓｔに充電された電圧は、第１電源ＥＬＶＤＤのリップルにかかわらず一定電圧を維持し、これにより、フリッカー（ｆｌｉｃｋｅｒ）現象の発生を防止することができる。   On the other hand, even if the voltage of the first node N1 changes due to the ripple of the first power supply ELVDD, the voltage charged in the storage capacitor Cst does not change and maintains a constant voltage. For example, when the voltage of the first node N1 rises due to the ripple of the first power supply ELVDD, the voltage of the second node N2 also rises. Therefore, the voltage charged in the storage capacitor Cst is irrespective of the ripple of the first power supply ELVDD. A constant voltage can be maintained, thereby preventing occurrence of a flicker phenomenon.

以上説明したように、本発明の最も好ましい実施形態について説明したが、本発明は、上記記載に限定されるものではなく、特許請求の範囲に記載され、又は明細書に開示された発明の要旨に基づき、当業者において様々な変形や変更が可能なのはもちろんであり、斯かる変形や変更が、本発明の範囲に含まれることは言うまでもない。   As described above, the most preferred embodiment of the present invention has been described. However, the present invention is not limited to the above description, and the gist of the invention described in the claims or disclosed in the specification. Of course, various modifications and changes can be made by those skilled in the art, and it is needless to say that such modifications and changes are included in the scope of the present invention.

１１０；走査駆動部
１２０；データ駆動部
１３０；画素部
１４０；画素
１４２；画素回路
１５０；タイミング制御部
Ｃｓｔ；ストレージキャパシタ
Ｍ１〜Ｍ４；第１ないし第４トランジスタ
Ｎ１、Ｎ２；第１ノード、第２ノード
ＯＬＥＤ；有機発光ダイオード 110; scan driving unit 120; data driving unit 130; pixel unit 140; pixel 142; pixel circuit 150; timing control unit Cst; storage capacitors M1 to M4; first to fourth transistors N1 and N2; Node OLED; organic light-emitting diode

Claims (14)

データ信号が供給されるデータ線、走査信号が供給される走査線、発光制御信号が供給される発光制御線、第１電源、及び基準電源に接続される画素回路と、前記画素回路と第２電源との間に接続される有機発光ダイオードとを備える画素であって、
前記データ線と第１ノードとの間に接続され、ゲート電極が前記走査線に接続される第１トランジスタと、
前記基準電源と第２ノードとの間に接続され、ゲート電極が前記走査線に接続される第３トランジスタと、
前記第１ノードと前記第２ノードとの間に接続されるストレージキャパシタと、
前記第１電源と前記有機発光ダイオードとの間に接続され、ゲート電極が前記第２ノードに接続される第２トランジスタと、
前記第１電源と前記第１ノードとの間に接続され、ゲート電極が前記発光制御線に接続される第４トランジスタとを備え、
前記データ信号は、前記基準電源と同一または高い電圧に設定され、前記第１電源より低い電圧に設定され、
前記第２ノードは、前記第４トランジスタがターンオンされたとき、フローティング状態に設定されることを特徴とする画素。 A data line to which a data signal is supplied, a scanning line to which a scanning signal is supplied, a light emission control line to which a light emission control signal is supplied, a first power supply, a pixel circuit connected to a reference power supply, the pixel circuit and the second A pixel comprising an organic light emitting diode connected between a power source and
A first transistor connected between the data line and a first node and having a gate electrode connected to the scan line;
A third transistor connected between the reference power source and a second node and having a gate electrode connected to the scan line;
A storage capacitor connected between the first node and the second node;
A second transistor connected between the first power source and the organic light emitting diode and having a gate electrode connected to the second node;
A fourth transistor connected between the first power source and the first node and having a gate electrode connected to the light emission control line;
The data signal is set to a voltage equal to or higher than that of the reference power supply, and is set to a voltage lower than that of the first power supply .
The pixel, wherein the second node is set in a floating state when the fourth transistor is turned on . 前記第１トランジスタは、前記走査信号に対応して前記データ信号を前記第１ノードに伝達し、前記第３トランジスタは、前記走査信号に対応して前記基準電源を前記第２ノードに伝達し、前記ストレージキャパシタは、前記データ信号と前記基準電源との差に対応する電圧を充電し、前記第４トランジスタは、前記発光制御信号に対応して前記第１電源を前記第１ノードに供給することを特徴とする請求項１に記載の画素。   The first transistor transmits the data signal to the first node in response to the scanning signal, and the third transistor transmits the reference power source to the second node in response to the scanning signal. The storage capacitor is charged with a voltage corresponding to a difference between the data signal and the reference power supply, and the fourth transistor supplies the first power supply to the first node in response to the light emission control signal. The pixel according to claim 1. 前記ストレージキャパシタに充電される電圧は、前記第１電源とは無関係に決定されることを特徴とする請求項１に記載の画素。   The pixel according to claim 1, wherein a voltage charged in the storage capacitor is determined regardless of the first power source. 前記第１トランジスタ及び第３トランジスタは同時にターンオンされ、前記第４トランジスタは、前記第１トランジスタ及び第３トランジスタがターンオンされたとき、ターンオフ状態に設定されることを特徴とする請求項１に記載の画素。   The method of claim 1, wherein the first transistor and the third transistor are turned on simultaneously, and the fourth transistor is set in a turn-off state when the first transistor and the third transistor are turned on. Pixel. 前記有機発光ダイオードは、赤色、緑色、及び青色のうちのいずれかの光を生成し、前記第２トランジスタから供給される電流量に対応して輝度が制御されることを特徴とする請求項１に記載の画素。   2. The organic light emitting diode generates light of any one of red, green, and blue, and the luminance is controlled in accordance with an amount of current supplied from the second transistor. The pixel described in. データ信号と基準電源との差に対応するデータ電圧をストレージキャパシタに充電するステップと、
駆動トランジスタの第１電極に第１電源の電圧を供給するステップと、
前記データ電圧及び前記第１電源に対応する駆動電圧を前記駆動トランジスタのゲート電極に供給するステップと、
前記駆動トランジスタの第２電極に接続された有機発光ダイオードに前記駆動電圧に対応する電流を供給するステップとを含み、
前記データ信号は、前記基準電源と同一または高い電圧に設定され、前記第１電源より低い電圧に設定され、
前記第１電源は、発光制御信号により制御される第４トランジスタがターンオンされたとき、前記第１ノードに供給され、
前記第２ノードは、前記第４トランジスタがターンオンされたとき、フローティング状態に設定されることを特徴とする有機電界発光表示装置の駆動方法。 Charging a storage capacitor with a data voltage corresponding to a difference between the data signal and a reference power supply;
Supplying a voltage of a first power source to the first electrode of the driving transistor;
Supplying a driving voltage corresponding to the data voltage and the first power source to a gate electrode of the driving transistor;
Supplying a current corresponding to the driving voltage to an organic light emitting diode connected to the second electrode of the driving transistor,
The data signal is set to a voltage equal to or higher than that of the reference power supply, and is set to a voltage lower than that of the first power supply .
The first power is supplied to the first node when a fourth transistor controlled by a light emission control signal is turned on.
The method of driving an organic light emitting display device, wherein the second node is set in a floating state when the fourth transistor is turned on . 前記データ信号は、走査信号が供給されたとき、第１トランジスタを経由して第１ノードに供給され、前記基準電源は、前記走査信号が供給されたとき、第３トランジスタを経由して第２ノードに供給されることを特徴とする請求項６に記載の有機電界発光表示装置の駆動方法。 The data signal is supplied to the first node via the first transistor when the scan signal is supplied, and the reference power supply is supplied to the second node via the third transistor when the scan signal is supplied. The method of driving an organic light emitting display according to claim 6 , wherein the driving method is supplied to a node. 前記第１トランジスタ及び第３トランジスタは、同時にターンオン及びターンオフされることを特徴とする請求項７に記載の有機電界発光表示装置の駆動方法。 The method of claim 7 , wherein the first transistor and the third transistor are turned on and off at the same time. 前記ストレージキャパシタに電圧が充電される期間において、前記第４トランジスタはターンオフされることを特徴とする請求項６に記載の有機電界発光表示装置の駆動方法。 7. The method of claim 6 , wherein the fourth transistor is turned off during a period when the storage capacitor is charged with voltage. データ信号が供給される複数のデータ線と、
走査信号が供給される複数の走査線と、
発光制御信号が供給される複数の発光制御線と、
前記データ線、走査線、及び発光制御線によって区画された領域に位置する複数の画素とを備え、
前記画素の各々は、
前記走査信号に対応して前記データ信号を 前記画素に供給するための第１トランジスタと、
前記走査信号に対応して基準電源を前記画素に供給するための第３トランジスタと、
前記データ信号と前記基準電源との差に該当するデータ電圧を充電するためのストレージキャパシタと、
前記発光制御信号に対応して前記ストレージキャパシタの第１端子に第１電源を供給するための第４トランジスタと、
自身のゲート電極に印加された電圧に対応する電流を供給するための第２トランジスタと、
前記第２トランジスタから供給される電流に対応して光を生成する有機発光ダイオードとを備え、
前記ストレージキャパシタの第１端子に前記第１電源が供給されたとき、前記ストレージキャパシタの第２端子には前記データ電圧及び第１電源に対応する電圧が印加され、
前記データ信号は、前記基準電源と同一または高い電圧に設定され、前記第１電源より低い電圧に設定され、
前記第４トランジスタがターンオンされたとき、前記ストレージキャパシタの第２端子は、フローティング状態に設定されることを特徴とする有機電界発光表示装置。 A plurality of data lines to which data signals are supplied;
A plurality of scanning lines to which scanning signals are supplied;
A plurality of light emission control lines to which light emission control signals are supplied;
A plurality of pixels located in a region defined by the data line, the scanning line, and the light emission control line,
Each of the pixels
A first transistor for supplying the data signal to the pixel in response to the scanning signal;
A third transistor for supplying a reference power to the pixel in response to the scanning signal;
A storage capacitor for charging a data voltage corresponding to a difference between the data signal and the reference power supply;
A fourth transistor for supplying a first power to the first terminal of the storage capacitor in response to the light emission control signal;
A second transistor for supplying a current corresponding to a voltage applied to its gate electrode;
An organic light emitting diode that generates light in response to a current supplied from the second transistor,
When the first power is supplied to the first terminal of the storage capacitor, a voltage corresponding to the data voltage and the first power is applied to the second terminal of the storage capacitor;
The data signal is set to a voltage equal to or higher than that of the reference power supply, and is set to a voltage lower than that of the first power supply .
The organic light emitting display as claimed in claim 1, wherein when the fourth transistor is turned on, the second terminal of the storage capacitor is set in a floating state . 前記基準電源は、前記複数の画素の各々において略同一の電圧に設定されることを特徴とする請求項１０に記載の有機電界発光表示装置。 The organic light emitting display as claimed in claim 10 , wherein the reference power source is set to substantially the same voltage in each of the plurality of pixels. 前記第１トランジスタ及び第３トランジスタは、同時にターンオン及びターンオフされることを特徴とする請求項１０に記載の有機電界発光表示装置。 The organic light emitting display as claimed in claim 10 , wherein the first transistor and the third transistor are turned on and off at the same time. 前記第４トランジスタは、前記第１トランジスタ及び第３トランジスタがターンオンされたとき、ターンオフ状態に設定されることを特徴とする請求項１２に記載の有機電界発光表示装置。 The organic light emitting display as claimed in claim 12 , wherein the fourth transistor is set in a turn-off state when the first transistor and the third transistor are turned on. 複数の画素、前記画素にデータ信号を伝達するためのデータライン、前記画素に走査信号を伝達するための走査線、前記画素に発光制御信号を伝達するための発光制御線、前記画素の各々に接続される第１電源、第２電源、及び基準電源を備える有機電界発光表示装置であって、
前記画素の各々は、
前記走査信号に対応して前記データ信号と前記基準電源との差に該当する電圧を充電するストレージキャパシタを備える画素回路と、
前記画素回路と前記第２電源との間に接続される有機発光ダイオードとを備え、
前記ストレージキャパシタの第１端子が前記第１電源に接続されたとき、前記ストレージキャパシタの第２端子は、フローティング状態に設定され、
前記データ信号は、前記基準電源と同一または高い電圧に設定され、前記第１電源より低い電圧に設定されることを特徴とする有機電界発光表示装置。 A plurality of pixels, a data line for transmitting a data signal to the pixel, a scanning line for transmitting a scanning signal to the pixel, a light emission control line for transmitting a light emission control signal to the pixel, and each of the pixels An organic light emitting display including a first power source, a second power source, and a reference power source connected to each other,
Each of the pixels
A pixel circuit comprising a storage capacitor for charging a voltage corresponding to a difference between the data signal and the reference power supply in response to the scanning signal;
An organic light emitting diode connected between the pixel circuit and the second power source;
When the first terminal of the storage capacitor is connected to the first power source, the second terminal of the storage capacitor is set in a floating state;
The organic light emitting display device according to claim 1, wherein the data signal is set to a voltage equal to or higher than that of the reference power source and is set to a voltage lower than that of the first power source.
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